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Et h y l Ga s o l i n e Co r p o r a t i o n Ch r y s l e r B u i l d i n g *105 Le x i n g t o n Av e n u e S AFETY DIVISION R o b e r t A. Ke h o e .M.D. CHAIRMAN O s c a r B. L e w i s M A N A GER Ru s s e l l S c h e l l A SSI STA N T M A N A GER N e w Y o r k November 2 8 , 19*40 D r . W. F . M a ch ie Dear B ill, S e v e r a l t im e s t h e q u e s t io n h a s come u p v e r y much l i k e t h e fo llo w in g p a r a gr a p h from ou r Los An ge le s D iv is io n : "An i n t e r e s t i n g p o in t cam e u p i n c o n n e c t io n w it h t h e d e f i n i t i o n o f a t h o r o u g h ly c le a n e d t a n k . We ca n n o t a ssu m e t h a t a t a n k h a s b e e n th orou gh ly clea n ed u n t il a ll o f th e slu d ge and lo o se m a te r ia l has been rem oved from t h e b ottom o f t h e ta n k an d t h e f l o o r i s d r y . T h e o r e t i c a l l y , vie ca n s a y t h a t im m e d ia t e ly p r i o r t o t h e r e m o va l o f t h e l a s t b u cket o f slu d ge, th e tan k h as n ot been th o r o u gh ly clea n ed and f u l l p r e c a u t io n s s h o u ld b e a p p l i e d . A g a in , t h e o r e t i c a l l y , vie ca n s a y t h a t a s soon a s th e la s t b u ck e t o f slu d ge h a s b een rem oved and th e flo o r i s clea n and d r y, th e tan k i s th orou gh ly clea n ed and our p r e ca u tio n s n e e d n o t a p p ly fo r e n t r a n c e in t o t h e t a n k . The p o in t vias m ade t h a t s in c e t h e d a n ger i s va p o r s a r is in g from t h e s lu d ge an d s in c e t h o s e vap ors a r e n ot on ly h e a vie r th an h yd rocarbon vap ors bu t h e a vie r th an a i r , i s i t n ot p o s s ib le , even a ft e r t h e so u r ce o f t h e s e va p o r s , n am ely th e s lu d ge , h a s b een rem oved, fo r th e va p o r s to s t i l l rem ain ? n o r m a lly, a e r a t io n o f th e ta n k would e lim in a t e an y r e m a in in g va p o r s in tim e, b u t wh a t i s t h e p r a c t i c a l t im e l i m i t b e t w e e n t h o s e i n s t a n t s vihen t h e t a n k is t h e o r e t ic a lly h azard ou s and t h e o r e t ic a lly n on -h azardou s?" I f you cou ld g iv e u s you r o p in io n on th e p o s s ib le t o x ic it y o f atm osphere in th e tan k a ft e r th e tan k h as been th orou gh ly clea n ed o f s o l i d m a t e r i a l , vie s h o u ld a p p r e c ia t e h a v in g i t . . Very t r u ly yo u r s , Kt 0022547